package thread;

public class SyncAPIDemo1 {
    public static void main(String[] args) throws InterruptedException {
        StringBuffer builder = new StringBuffer();
        Thread t1 = new Thread() {
            public void run() {
                for (int i = 0; i < 1000; ++i) {
                    builder.append("a");
                }
            }
        };
        Thread t2 = new Thread() {
            public void run() {
                for (int i = 0; i < 1000; ++i) {
                    builder.append("b");
                }
            }
        };
        t1.start();
        t2.start();
        Thread.sleep(1000);
        System.out.println(builder.length());
    }
}
